Means for securing tools in boring-bars



A. R. SWANSON.

MEANS FOR SECURING TOOLS IN BORING BARS. APPLICATION men s 918.

1,378,062, Patented May 17,1921.

Java/Liar.

flzeZfZ Swanson UNIT AXEL R; SWANSON, or omzcaeo, ILLINOIS. Y

MEANS ron sncnnme TOOLS IN Bonnie-Bans.

To all who) it may concern:

Be it known that I, Axen R. Swansoma citizen of the United States,residing at Chicago, in the county ofCook arid State of Illinois, haveinvented certain new and useful Improvements in Means for Securing Toolsin Boring-Bars, ofwhich the following is a specification.

Iy invention relates to means 'for securing tools in boring bars of thetype, shown and describedv in Serial No. 251,531, filed August 26, 1918,and has particular reference to means for Securing a cutting tool inproper position in a boring bar and holding the cutting tool securely inany desired oradjusted position.

One object of my invention is the provision of means whereby the cuttingtool may be easily adjusted in the boring bar so as to provide for-theproper 'depth'of cut in the work piece and for readjusting the cuttingtool with each successive cut that is madethrough the inetah l Anotherobject of my invention is the provision of means for holding the cuttingtool securely, thus rendering the boring bar more safe in operation andwhich will not, un-

der the strain of operating conditions, break and thereby perhaps injurethe operator.

My invention will be further and better understood by reference to theaccompanying drawings in whichv Figure 1 is aside-elevation, parts beingin section, of' my improved device; 4

Fig. 2 is a vertical sectional view on lines 2-2 of Fig. 1;

Fig. 3 is a top view ofmy device;

Fig. 4 is a view in end elevation of the gib which holds the cuttingtool; I Fig. 5 is a vertical sectional view showing the slot for thereception of the gib;

Fig. 6 is a view artially in section showing a slightly modified form ofholding device;

Fig. 7' is a fragmentary plan view of the boring bar; and i Fig. 8 is avertical sectional view on lines 8-8 of Fig. 6 and showing the modifiedform of gib. r Referring now specifically to the drawings, a boring bar10 is shown having a transverse aperture including twoassociatedtmsecurely in position, th I parallel holes 11 and 13,preferably circular in sectionyoneof said holes 11- being for thereception of a cutting tool 12, and the provide the tool making theproper depth 110 my co'pending application,

other for the reception of a wedgeeshaped. 'A relatively narrow neck orbetween and connects the 1 member '21. slot 14 extends holes 11 and 13.The boring bar is slightly beveled at the outsideedges of the slot or'neck 14 between the holes 11 and 13, thus producing a pair .of shoulders15,, 15, and 16, 16, at each end of the slot 14 for the purposeshereinafter described. the transverse slot 14 is a gib' 17 having alateral extension 18 at its upper end" through which a screwlfl passesin threaded engage Specification of Letters Patent. a p t t May 1 31 2'ipplication med seaw ter 12, 1918. serialNo. 253,783.

Fitted within a 7' ment with the said extension 18 and which ispositioned over a the purpose of adjusting the cutting tool 12.

I lowerend, the sides =of the head. '20 fitting against the shoulders15,15, or against the shoulders 16, 16.- depeiicing upon which way the gib1T is inserted "in the slot" 14, thus serving to hold the gib 17securely in posi- --tion andprevcnting its beingdrawn through the slot14. The gib 17 is tapered slightly in a longitiidinal ward so' that awedgingfaction takes place between. tlie'gib 17 and the'wedg'e member 21which is fitted Within the aperture with its inclined face against theib-17, thus securely holding the gib inposition and also holding the.cutting, tool 12 securely in the boring bar but allowing for a verticalmovement. of the cutting tool 12 under the force exerted by the screw19:

the cutting toolg -til2 for.

direction from its top down- Referring now to Fig. 6 wherein a slightmodification of the device is shown, the cut ting tool 12 is shown heldin position by a 24 at each of its ends so as to (prevent movement of.the 'g'i'b 22 longitu inally of the slot 14, the purpose of thisparticular con- I struction being to facilitate adverse operatingconditions, for example, where the boriing bar is inserted in a coveredor other openi ng'which would be toosmall to allow the extension 18 andthe screw 19 to 'pass into the opening, theboring banbeing inserted andthe cutting end ofthe tool 12 brought into contact with the work; Thistype of gib can be used for holding the tool 'tool '12 being adjusted byslight blow ith a hammer or driven through the bar a slight distance to-17. The gib 22 has headportions 23 and- 70 e member 17 has ahead portion20. at its of cut by means of a punch until the opening is large enoughso the gib 17 can be used. y

In assemblingthe device and holding the euttin tool 12 in position thecutting tool 12 is inserted into the hole 11, the gib. 17

is inserted into the hole 13 and then slipped over into the slot 14 andthe wedge shaped member 21 is thereupon insertedinto'thetransverselyextending hole '13 and lightly driven into place. It will beunderstood,of course, that the wedge member 21 should not be driventooti htly or movement of the cutting tool 12 Wlii not be permittedorwill be made too difficult, and yet the member 21- should be driventightlyienoughto hold the cutting tool 12 securely. When the device isin proper position the screw 19 can be turnedv until its lower end is'incontactzwith the upper endof the cutting tool 12 and the cutting toolcan thus be adjusted to any desired depth of=cut. I A v Italso will beunderstood that the cuttingtool 12- will' fit into the transverselyextending aperture 13 andthe wedge-menther 21. into the opening 11 sothat their re speetiye, sitions are reversed from the pos sitions sWn'in' the drawing and; the gib turned around so that the extension'18projects in.a direction opposite to'thatvsho wn if desired for anyparticular purpose in'0r-.

der to properly position'the cutting tool 12 in thework being done. Theround cutting tool 12 has'a 'squared top to allow a wrench or other;toolto grip the cutting tool so that it may be turned into properposition.

While ,I have described precisely the ,de-

. tails of cdnst-ruction, I do not wish to be understood aslimitingmyself thereto, as l contemplate changes in. form and the pro portion ofparts and the substitution of equivalents as circumstances may suggestor renderexped ent' without departing from the spirit. or soop'e' of myinvention as de 2. Incombmation a bbri ng barj 'lhaving cutting tool.

apertures therethrough, a cutting tool and- .a palrotoppositely disposedwedge memhere within said apertures and adapted to hold said cuttingtool in position, one of said wedge members being secured againstlongitudinal movement. 3. In combination a boring bar having aperturestherethrough, a cutting tool, a gih having a headincontact with the edgeof I one of the said apertures and a wedge mem ber within one of theother of said apertures adapted to hold the gib securely against thecutting tool.

4. In combination a boringjbar having a pair of apertures therethroughwith a slot connecting-the said apertures, a cutting tool mounted withinone of said apertures, a

gib having a head at one of its ends and an extension at its other-end,a wedge member within one of said apertures and means con nected withsaid extension for adJllStlIlgthB 5. In combination a boring barhaving apanoi apertnres therethrough with a slot connecting the said apertures,a eutting'tool mounted Within one of said apertures, a gib havinga helat one of its ends and an 'extension at ns other end, a wedge memberwithin one of said apertures and a screw in I threaded engagement withsaid extension for adjusting the cutting tool, y

I 6. In combination a boring bar having a pair of transverse aperturestherethrough and having a slot connecting said apertures, a cutting toolmounted within one of said apertures, a gib having a head portion'incontact with the edges of thetransverseslot and having-an extensiononit's oppos teend I V and ascrew; through said extension whereby thecutting tool 1s":id usted. H 1

7. In combinatlon a boring bar having a pair of apertures therethroughand having a slot therein connecti'ngsaid ape1'tures,a 1

cutting tool mounted within one of said apertures; and a pair' ofco-acting wedge members,'one of said wedgemembers being mounted inltheslot and the other iii-one of the apertures, adapted to secure saidoutting tool in position, one: of 'saidwedge memv bers'. being secured'against longitudinal movement.

, Signed at Chicago, Illinois, this 22nd da of August, 1918.

AXEL n. SWANSQN.

